For the first time since slot machines were legalized in 1995, gambling revenues fell in the state of Delaware in the fiscal year that ended Monday. According to estimates from the state Finance Department, slot machine revenues dropped by six-point-five percent from the previous year. The casinos attribute the current revenue slump to the smoking ban, which began in November, and to the sluggish economy. Lawmakers have approved some changes that could raise more revenue. The state will get a larger share of the casino revenue, casinos will be able to open for additional hours and the maximum number of machines at each site has increased by 500 machines.